Jonathan mason and joseph mason



(No Model.)

JONATHAN MASON, JOSEPH MASON &.W. S. OODNER. TREAD FOR STAIRS, &c.

No. 481,702. Patented Aug. 30, 1892.

UNrrnn STATES ATENT OFFICE.

JONATHAN MASON AND JOSEPH MASON, OF LONDON, AND WVILLIAM S. OODNER, OFSTOKE NEWINGTON, MIDDLESEX, ENGLAND.

TREAD FOR STAIRS, as.

SPECIFICATION forming part of Letters Patent No. 481,702, dated August30, 1892.

Application filed June 11, 1892. Serial No. 436,339. (No model.)Patented in England April 7, 1891, No. 5,988; in France April 25,189L110. 212,953, and in Belgium April 29, 1891, No. 94,712.

To all whom it may concern.-

Be it known that we, JONATHAN MASON and JOSEPH MASON, builders andcontractors, of 15 Barbecan, in the city of London, and WIL- LIAMSQUIRES CODNER, iron-merchant, of 10 Queen Elizabeth Talk, StokeNewington, in the county of Middlesex, England, have invented certainnew and useful Improvements in Treads for Stairs and the Like, of whichthe following is a specification.

This invention relates to a novel manufacture of treads for stairs,coverings for floors, cover-plates for coal-holes, openings forhydrants, manholes for sewer ways, 850., steps for carriages and othervehicles, foot-plates for locomotives, deck-coverings for ships, and forother purposes, the object of the invention being to produce a durablenon-slipping surface.

In the accompanying drawings, Figure 1 shows in plan View our inventionas adapted to a stair-tread by way of example. Fig. 2 is a transversesection of the same, and Figs. 3 and 4 may be said to be diagramsshowing two stages in the production of the treads according to ourinvention. Fig. 4. shows a modified form of rib, and Fig. 5 is across-section of the filling material.

A is the base-plate, of hardmetal-say mild steelwhich forms thewearing-surface, and c are strips of a softer material-say lead whichare let into the base-plate and which form a non-slipping surface.

In carrying out our invention we form the plate with raised ribs andintermediate spaces undercut or of dovetail shape in cross-section, soas to provide a key or holding surface for the soft filling-pieces.

In the production of the plates we prefer to roll them; but we may alsocast them, stamp them, or produce them in any other manner to receivethe strips.

WVhen producing the plates A with the raised ribs and dovetail spaces byrolling when hot, we may proceed in the following manner-that is to say:We first obtain a plate with rectangular ribs a and spaces Z) and with anosing c in the ordinary manner. WVe next subject the plate so formed toa second rolling operation with rolls of the forms (more or less)indicated by dotted lines at Fig. 4, by means of which each rib a is cutopen, as it were, and one or more V-grooves d may be formedlongitudinally thereof. At the same time the sides of the spaces will bepushed inward to give to the spaces 1) a double-dovetail shape, as seenat Fig. 4, or the rolls may be of inverted-V shape to produce a rib ofthe form shown at Fig. 4., in which figure the spaces will still bedovetailed. The plate so formed is ready to receive the strips of softmaterial. We next take strips of lead 6 of the section shown at Fig. 5or a similar section, place them in the spaces 1), and subject them topressure in a rolling-mill or otherwise, by which means the spacesbbecome filled up with the soft material flush with the highest point ofthe ribs a, as shown in Figs. l and 2, thus forming a non-slippingtreading-surface having a frame, so to speak, formed by nonwearinghard-metal ribs 0..

The production of covering-plates of various kinds and other articleswill be effected in practically the same manner, the plate beingpreferably inclosed in a metal frame.

The filling material may (in place of lead) be tarred rope, which willbe compressed into the spaces while the plate is warm, or other softnon-slipping material may be employed. "What we claim is- A tread forstairs and other purposes, consisting of a plate A, of hard metal,provided with ribs a and undercut or dovetail-shaped spaces 1) betweenthe ribs, in combination with filling-pieces e, of soft non-slippingmaterial, placed in the spaces 1), as and for the purpose set forth.

JONATHAN MASON. JOSEPH MASON. WILLIAM S. OODNER. Witnesses:

H. K. WHITE, W. F. O. Gon'rz.

